Astronomy:2MASS J02431371-2453298
Coordinates: 
02h 43m 13.72s, −24° 53′ 29.8″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 43m 13.72s[1] |
| Declination | −24° 53′ 29.8″[1] |
| Characteristics | |
| Spectral type | T6 |
| Apparent magnitude (J) | 15.38 ± 0.05[1] |
| Apparent magnitude (H) | 15.137 ± 0.109[1] |
| Apparent magnitude (K) | 15.216 ± 0.168[1] |
| Astrometry | |
| Proper motion (μ) | RA: -288 ± 4[1] mas/yr Dec.: -208 ± 3[1] mas/yr |
| Parallax (π) | 93.62 ± 3.63[2] mas |
| Distance | 35 ± 1 ly (10.7 ± 0.4 pc) |
| Details | |
| Temperature | 800 – 1300 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
2MASS J02431371-2453298 (abbreviated to 2MASS 0243-2453) is a brown dwarf of spectral class T6,[3][1] located in the constellation Fornax about 34.84 light-years from Earth.[2]
Discovery
2MASS 0243-2453 was discovered in 2002 by Adam J. Burgasser et al. from Two Micron All-Sky Survey (2MASS), conducted from 1997 to 2001. Follow-up observations were made in 1998—2001 using the Near-Infrared Camera, mounted on the Palomar 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0243-2453. This 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and this discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[3]
Distance
Currently the most precise distance estimate of 2MASS 0243-2453 is published in 2004 by Vrba et al. trigonometric parallax, measured under U.S. Naval Observatory Infrared Astrometry Program: 93.62 ± 3.63 mas, corresponding to a distance 10.68 ± 0.43 pc, or 34.84 ± 1.41 ly.[2]
2MASS 0727+1710 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Vrba et al. (2004) | 93.62 ± 3.63 | 10.68 ± 0.43 | 34.84 ± 1.41 | [2] |
Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.
Space motion
Position of 2MASS 0243-2453 shifts due to its proper motion by 0.3548 arcseconds per year.
Properties
Using an evolutionary model, the surface temperature of 2MASS 0243-2453 is estimated to be 1040–1100 K, and its mass is estimated at 2.4–4.1% that of the Sun, its diameter 9.2 to 10.6 that of the Sun, and age 0.4–1.7 billion years.[4]
As with other brown dwarfs of spectral type T, its spectrum is dominated of methane.
See also
The other 10 brown dwarfs, presented in Burgasser et al. (2002):[3]
- 2MASS 0415-0935 (T8)
- 2MASS 0727+1710 (T7)
- 2MASS 0755+2212 (T5)
- 2MASS 0937+2931 (T6)
- 2MASS 1534-2952 (T5.5)
- 2MASS 1546-3325 (T5.5)
- 2MASS 1553+1532 (T7)
- 2MASS 2254+3123 (T5)
- 2MASS 2339+1352 (T5.5)
- 2MASS 2356-1553 (T6)
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "2MASS J02431371-2453298 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2MASS+J02431371-2453298. Retrieved 2012-11-26.
- ↑ 2.0 2.1 2.2 2.3 Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, A. J.; Kirkpatrick, J. Davy et al. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astronomical Journal 127 (5): 2948–2968. doi:10.1086/383554. Bibcode: 2004AJ....127.2948V.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Burgasser, A. J.; Kirkpatrick, J. D.; Brown, M. E.; Reid, I. N.; Burrows, A.; Liebert, J.; Matthews, K.; Gizis, J. E. et al. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal 564 (1): 421–451. doi:10.1086/324033. Bibcode: 2002ApJ...564..421B.
- ↑ "Method for Determining the Physical Properties of the Coldest Known Brown Dwarfs". The Astrophysical Journal 639 (2): 1095–1113. 2006. doi:10.1086/499344. Bibcode: 2006ApJ...639.1095B.
External links
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